GB466981A - Improvements in or relating to antenna coupling devices - Google Patents
Improvements in or relating to antenna coupling devicesInfo
- Publication number
- GB466981A GB466981A GB9136/36A GB913636A GB466981A GB 466981 A GB466981 A GB 466981A GB 9136/36 A GB9136/36 A GB 9136/36A GB 913636 A GB913636 A GB 913636A GB 466981 A GB466981 A GB 466981A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- wave
- long
- medium
- coils
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000008878 coupling Effects 0.000 title abstract 2
- 238000010168 coupling process Methods 0.000 title abstract 2
- 238000005859 coupling reaction Methods 0.000 title abstract 2
- 230000001629 suppression Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/18—Modifications of frequency-changers for eliminating image frequencies
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Superheterodyne Receivers (AREA)
Abstract
466,981. Wireless receiving circuits. PHILCO RADIO & TELEVISION CORPORATION. March 27, 1936, No. 9136. Convention date, April 8, 1935. [Class 40 (v)] A wave trap is provided to suppress medium wave image frequencies when a set is receiving long-wave stations and switching means is provided for making the long and medium wave receiving coils ineffective when medium and long waves respectively are being received. If necessary a long-wave trap may also be used when the set is switched for medium wave reception. When the set is to receive long-wave stations, the switches S1, S2, are in positions B, B1 ; coil L2 is shorted to earth and coils L1, L4 are in series but only coil L4 is coupled to the secondary circuit. Coil L1 is broadly resonant to the medium wave frequency band and presents a very high impedance to medium wave signals whilst the suppression of the signals is further enhanced by the shorting of coil L2 to earth. The coil L1 is of low impedance compared with the coil L4 for the long wave signals, which it is desired to receive. When the switches S1, S2 are in positions A, A1 the coils L1, L4 are in shunt relation with the coil L2 and coil L5 is shorted. Image rejection in this frequency band occurs by virtue of the location of the intermediate frequency but if necessary a parallel tuned trap may be provided. The coil Cl serves as a pad for the tuning condenser VC when the switch S1 is in position B and as a coupling impedance only when the switch is in position A.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15333A US2050912A (en) | 1935-04-08 | 1935-04-08 | Antenna coupling device |
Publications (1)
Publication Number | Publication Date |
---|---|
GB466981A true GB466981A (en) | 1937-06-09 |
Family
ID=21770811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9136/36A Expired GB466981A (en) | 1935-04-08 | 1936-03-27 | Improvements in or relating to antenna coupling devices |
Country Status (2)
Country | Link |
---|---|
US (1) | US2050912A (en) |
GB (1) | GB466981A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE740682C (en) * | 1940-04-19 | 1943-10-26 | Licht Und Kraft Ag | Input circuit for overlay receivers |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL65133C (en) * | 1943-03-03 | |||
US2617927A (en) * | 1945-11-09 | 1952-11-11 | Sissman Louise | Interference eliminating system |
-
1935
- 1935-04-08 US US15333A patent/US2050912A/en not_active Expired - Lifetime
-
1936
- 1936-03-27 GB GB9136/36A patent/GB466981A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE740682C (en) * | 1940-04-19 | 1943-10-26 | Licht Und Kraft Ag | Input circuit for overlay receivers |
Also Published As
Publication number | Publication date |
---|---|
US2050912A (en) | 1936-08-11 |
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